High-tech analysis of proto-mammal fossil clarifies the mammalian family tree

A new analysis of the jaw of one of the earliest known proto-mammals sheds light on efforts to accurately date the period when mammals first evolved and clarifies the mammalian family tree. The study suggests that the great explosion in mammal diversification occurred in the Jurassic around 175 million years ago — more than 30 million years after the forerunners to mammals diversified in the Triassic.
Paleontology News — ScienceDaily